Give AbbeyMS a call, details here: http://www.abbeymotorsport.co.uk/site_flash/index6.html
Ask to speak to Mark, tell him you spoke to Adrian / octet and ask for fitting quote. I'll email him now to let him know you're going to call him.
Spark plugs about £150, Mark has them in stock I believe, plenum spacer I have mine for sale for £125 delivered, tuning wise about 5 hours on the Dyno + UpRev license if you don't have it already.